Dim list As New List(Of String) From
    {
        "a",
        "b",
        "c"
    }
 
With ComboBox1
    .DropDownStyle = ComboBoxStyle.DropDownList
    .SuspendLayout()
    .Items.AddRange(list.ToArray)
    .SelectedIndex = 0
    .ResumeLayout()
End With

List<string> list = new List<string> {
	"a",
	"b",
	"c"
};
 
var _with1 = ComboBox1;
_with1.DropDownStyle = ComboBoxStyle.DropDownList;
_with1.SuspendLayout();
_with1.Items.AddRange(list.ToArray);
_with1.SelectedIndex = 0;
_with1.ResumeLayout();
 
//=======================================================
//Service provided by Telerik (www.telerik.com)
//=======================================================

Imports System.Globalization
Imports System.Threading
 
Public Class Form1
 
    Public Shared listaDisco As New List(Of Disco) From
        {
            New Disco With {.titulo = "a", .genero = "Rock"},
            New Disco With {.titulo = "b", .genero = "Pop"},
            New Disco With {.titulo = "c", .genero = "Dubstep"},
            New Disco With {.titulo = "d", .genero = "dubstep"}
        }
 
    Class Disco
        Public titulo As String
        Public genero As String
        Public año As Integer
        Public autor As String
        Public precio As Double
        Public fecha_registro As DateTime
    End Class
 
    Private Sub test() Handles MyBase.Shown
 
        Dim currentCulture As CultureInfo = Thread.CurrentThread.CurrentCulture
        Dim textInfo As TextInfo = currentCulture.TextInfo()
 
        Dim genres As IEnumerable(Of String) =
            (From disc As Disco In listaDisco
             Select textInfo.ToTitleCase(disc.genero)
             Distinct)
 
        With ComboBox1
            .Sorted = True
            .SuspendLayout()
            .Items.AddRange(genres.ToArray)
            .SelectedIndex = 0
            .ResumeLayout()
        End With
 
    End Sub
 
End Class

using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.Globalization;
using System.Threading;
 
public class Form1
{
 
	public static List<Disco> listaDisco = new List<Disco> {
		new Disco {
			titulo = "a",
			genero = "Rock"
		},
		new Disco {
			titulo = "b",
			genero = "Pop"
		},
		new Disco {
			titulo = "c",
			genero = "Dubstep"
		},
		new Disco {
			titulo = "d",
			genero = "dubstep"
		}
 
	};
 
	public class Disco
	{
		public string titulo;
		public string genero;
		public int año;
		public string autor;
		public double precio;
		public DateTime fecha_registro;
	}
 
 
	private void test()
	{
		CultureInfo currentCulture = Thread.CurrentThread.CurrentCulture;
		TextInfo textInfo = currentCulture.TextInfo();
 
		IEnumerable<string> genres = (from disc in listaDiscotextInfo.ToTitleCase(disc.genero));
 
		var _with1 = ComboBox1;
		_with1.Sorted = true;
		_with1.SuspendLayout();
		_with1.Items.AddRange(genres.ToArray);
		_with1.SelectedIndex = 0;
		_with1.ResumeLayout();
 
	}
	public Form1()
	{
		Shown += test;
	}
 
}
 
//=======================================================
//Service provided by Telerik (www.telerik.com)
//Conversion powered by NRefactory.
//=======================================================